Drive-chain and sprocket-wheel therefor.



. UNITED STATES;

Patented August 11, 1903.

PATENT OFFICE.

FREDERIO V. I-IEI-ZEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THELINK BELT ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYL VANIA,ACORPORATION OF PENNSYLVANIA.

DRIVE-CHAIN AND SPROCKET-WHEEL THEREFQR.

SPECIFICATION forming part of Letters Patent No. 736,256, dated August11, 1903.

Application filed February 5, 1903. Serial No.142,044. (-No model.)

To aZZ whom it may concern:

Be it known that I, FREDERIO V. HETZEL, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Drive-Chains and Sprocket-Wheels Therefor, of which thefollowing is a specification.

The main object of my invention is to construct a drive-chainof thesilent type, in

m which the links are open and detachable one from another.

A further object of my invention is to improve the construction ofsprocket-wheel used in connection with the above mentioned I 5drive-chain.

Referring to the accompanying drawings, Figure l is a longitudinalsectional view of a drive chain, showing its relation to thesprocket-wheel. Fig. 2 is a plan view of part of the sprocket-wheelshown in Fig. 1 with one of the links of the chain in-position, theother links being removed to avoid confusion.

Fig. 3 is a section on the line 3 3, Fig. 1. Fig. 4 is a detached planview of one of the links, and Fig. 5 is a, detached side view of one ofthe links.

A is a sprocket-wheel having teeth Ct extending from one side of thewheel to the other. These teeth are stepped, as shown,

0 being lower at ,each side a than at the center a for thepnrposedescribed hereinafter.

B B are the. links of a drive-chain. Each link is made as shown in Figs.4 and 5, having side members 1) I), connected by an end member I), inwhich is a socket for a pin. At the opposite end of each side member I)b are sockets b so that when the links are assembled the sockets b and bare in line and are held by pins 0. The socket b has a bushing.

40 c, which is held from turning in the socket by a projection 19 in thepresent instance. Extending from the socket b is a tapered tooth e, andextending from each of the sockets b is-a tapered tooth e. The teeth 6of 4; the links rest against the bearing-surfaces of the reducedportions a of the teeth a, while the toothe rests. against the centralextension a of the tooth a. I preferably so prois not absolutelynecessary, it is preferable, as

these side members rest directly over the reduced portions a of theteeth of the wheel,

while the center portions of the teeth of the wheel extend into the openspace of the link and hold the chain in line with the Wheel, dispensingwith the side flanges usually employed in this type of. Wheel.

I have shown in the drawings thelinks so proportioned in respect to thesprocket-wheel that two teeth of the sprocket-wheel extend into eachopen link of the dri ve-chain. some instances, however, this proportionmay vary, and a single tooth only may extend into the link of thedrive'chain or more than two, depending altogether upon the length ofthe link.

I claim as my invention 1. The combination of a sprocket-wheel havingteeth with reduced portions at each side and a central extension, achain having a central row of teeth and a row of teeth at each side, thecentral row of teeth bearing against the central portion of the teeth ofthe sprocket-wheel and the side teeth bearing against the side portions,substantially as described.

2. The combination of a sprocketwheel having teeth higherat the centerthan at the sides, a chain made up of a series of detachable links, eachlink having side members and an end member, a tooth on the end memberand a tooth on each of the side members, the teeth of the side membersbeing in line with the reduced portions of the teeth of. thesprocket-whee1 and the teeth of the end member being in line with thecentral portion of the teeth of the sprocket-wheel, substantially asdescribed.

3. The combination of a sprocket-wheel area of the bearing of the sideteeth, suhstan- 1o 1 tially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERIO V. HETZEL.

Witnesses:

WILL. A. BARR, Jos. H. KLEIN.

